Chrysler Concorde 1993, Service Manual, Page: 422 / 820

Rubber lipped seals are used at front and rear. The
front seal is retained in the oil pump case and the
rear is retained in a block-mounted housing.
PISTONS: Are aluminum alloy with a steel strut,
short height, and thin wall to be light weight. The
piston head with valve recesses, in combination with
the cylinder head, forms a compact spherical head
with clearance for total valve lift with pistons at top
dead center. The piston skirt, top and second ring
lands are finished to a tapered roughness for oil re-
tention and high resistance to scuffing. Piston pins
are full-floating, join the pistons to the connecting
rods.
CYLINDER HEAD: The aluminum alloy cylinder
heads feature cross-flow type intake and exhaust
ports. Valve guides and inserts are powdered metal.
Valves of heat resistance steel are arranged in a V
with each camshaft on center. To improve combus-
tion speed the chambers are a compact spherical de-
sign with a squish area of approximately 30 percent
of the piston top area. The cylinder heads are com-
mon to either cylinder bank by reversing the direc-
tion of installation.
CAMSHAFTS: Two overhead camshafts provide
valve actuation, The left camshaft is provided with a
DIS pick-up wheel and is longer. Both camshafts are
supported by four bearing journals, thrust for the
camshafts is taken at the thrust plate attached to the
rear of the cylinder head. Right and left camshaft
driving
sprockets are not interchangeable. The
sprockets and the engine water pump are driven by a
single notched timing belt.
ROCKER ARM SHAFTS: The shafts are retained
by the aluminum alloy pedestals. Four shafts are
used, one for each intake and exhaust rocker arm as-
sembly on each cylinder head. The hollow shafts pro-
vide a duct for lubricating oil flow from the cylinder
head to the valve mechanisms.
ROCKER ARMS: Are of light weight permanent
mold aluminum alloy with roller type follower oper-
ating against the cam shaft. The valve actuating end
of the rocker arms are machined to retain hydraulic
lash adjusters, eliminating valve lash adjustment.
VALVES: Are made of heat resistant steel and are
further treated to resist heat.
VALVE SPRINGS: Are especially designed right
and left wound valve spring wire. Valve spring re-
tainers, locks and valve spring seat are intergal with
the valve seal which includes a garter spring on it.
INTAKE MANIFOLD: The aluminum alloy man-
ifold is a cross type with long runners to improve in-
ertia. The air plenum chamber absorbs air pulsations
created during the suction phase of each cylinder.
EXHAUST MANIFOLDS: Both manifolds are a
log style made of ductile cast iron.
ENGINE LUBRICATION: System is a full flow
filtration, pressure feed type. The oil pump body is
mounted to the engine block. The pump inner rotor
is driven by the crankshaft. A windage tray, intregal
with the oil pan gasket, increases power by minimiz-
ing oil windage at high engine rpm.
SPECIFICATIONS
Fig. 1 Engine Identification
3.5L ENGINE 9 - 39